---
id: CVE-2025-66434
title: >-
  An SSTI (Server-Side Template Injection) vulnerability exists in the
  get_dunning_letter_text method of Frappe ERPNext through 15.89.0
summary: >-
  An SSTI (Server-Side Template Injection) vulnerability exists in the
  get_dunning_letter_text method of Frappe ERPNext through 15.89.0. The function
  renders attacker-controlled Jinja2 templates (body_text) using
  frappe.render_template() w…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
  - CWE-1336
vendor: frappe
product: erpnext
affected:
  - erpnext <= 15.89.0
published: '2025-12-15'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66434'
references:
  - url: 'https://iamanc.github.io/post/erpnext-ssti-bug-1'
    label: cve@mitre.org
  - url: >-
      https://www.notion.so/SSTI-bug-1-239e6086eadc8096bfcfe90551a3a483?source=copy_link
    label: cve@mitre.org
tags:
  - nvd
epss: 0.0059
epssPercentile: 0.46796
ingestedAt: '2026-10-14T13:30:58.429Z'
---

## Overview

An SSTI (Server-Side Template Injection) vulnerability exists in the get_dunning_letter_text method of Frappe ERPNext through 15.89.0. The function renders attacker-controlled Jinja2 templates (body_text) using frappe.render_template() with a user-supplied context (doc). Although Frappe uses a custom SandboxedEnvironment, several dangerous globals such as frappe.db.sql are still available in the execution context via get_safe_globals(). An authenticated attacker with access to configure Dunning Type and its child table Dunning Letter Text can inject arbitrary Jinja expressions, resulting in server-side code execution within a restricted but still unsafe context. This can leak database information.

## Affected

- `erpnext <= 15.89.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.